Method of making belt-pulleys.



Patented Ian. 9, I900.

B. CHILLINGWOBTH.

- METHOD OF MAKING ,BELT PULLEYSJ (Application filad. July 18, 1899.)

UNITED STATES PATENT OFFICE.

RUDOLF GIIILLINGWORTH, OF NUREMBERG, GERMANY.

METHOD OF MAKING BELT-PULLEYS.

SPECIFICATION forming part of Letters Patent No. 640,876, dated January9, 1900. Application filed July 18, 1899. Serial No. 724,321. (Nomodel.)

To aZZ whom it may concern:

Be it known that I, RUDoLF CHILLING- WORTH, manufacturer, a subject ofthe German Emperor, residing at Nuremberg, Bavaria, German Empire, haveinvented Improvements in Methods of Making Belt-Pulleys, of which thefollowing is a specification.

This invention has for its object a method of making belt-pulleys, evenof the largest dimensions of pieces of tube, without fear of thestrength or firmness of the belt-pulley being affected by the thinnessof the walls of the pieces. For this object the belt-pulley, as shown inFigure 1 of the accompanying drawings, is formed of segment or sectorshaped partsfor instance, in Fig. 1 of five parts. The method of makingthese segmentpieces consists in short pieces of tube of the length ofthe belt-pulley which is to be made being converted by drawing,pressing, or the like into sector-shaped fiat metal bodies of the formshown in Fig. 1, after which these fiat bodies may be arranged withtheir plane surfaces against one another and held together by screwingor the like to form acomplete belt-pulley.

One way of carrying out this method is shown as an example in Figs. 2 to10. A short piece of tube a is placed with its lower edge on a matrixI), Fig. 2, and expanded into a segment or sector shaped fiat metalbody, Fig. 5, by means of a die or stamp c d inserted in the piece oftube. In order to allow of this, the under part of the said stamp c hasa cylindrical cross-section, Fig. 4, and this cylindrical part fitsexactly into the tube a, while the upper part 01 has a sector-shapedcrosssection, Fig. 3. The change from the cylindrical to thesector-shaped part is only a gradual one, so that when the stamp ispressed down the piece of tube a is quite gradually expanded to thesector-shaped sheet-metal body shown in Figs. 5 and 6. The matrix b, as

shown in Fig. 4, has a recess 6, in which the stamp fits when depressed.The sheet-metal body a, Fig. 6, is then placed in a matrix h, Fig. 7,having a cylindrical hollowed-out part corresponding to the diameter ofthe belt-pulley to be formed, an intermediate piece in two parts f g ofthe form shown in Fig. 10 being insertedin the fiat metal body a. Bypress= ing down a sector-shaped stamp i, the pros sure-surfaces of whichare provided with ex crescences or projections Z, as shown in Fig. 8,the fiat tube walls are made to agree with the side surfaces of theintermediate pieces f and g, Fig. 10, in such a way that thesector-shaped body a (shown in Fig. 9 with lateral impressed surfaces m)is produced. Simultaneously this body a on the depression of the stampi, Fig. 8, which at n, Fig. 7, is cylindrically shaped to correspondwith the hub-hole, receives a rounding corresponding to the cylindricalpart of the stamp c', which rounding could only be imperfectly obtainedby the expansion which takes place by the operation shown in Fig. 2. Thesector-shaped fiat metal bodies obtained in this manner and having theform shown in Fig. 9 are placed together, with their impressed surfacesin contiguity and combined or connected by means of screwing or the likein the manner shown in Fig. 1 to form a belt-pulley in the present casecomposed of five parts, but in any case of several parts.

Having now particularly described and ascertained the nature of my saidinvention and in What manner the same is to be per formed, I declarethat what I claim is- The herein-described method of making belt-pulleysconsisting in expanding a series of tubular sections into segmentalshape and securing said sections together to form the complete pulley,substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

RUDOLF GI-IILLINGWORTI-I.

Witnesses:

ANDREAS STIoH, OsoAR BOOK.

